CN108343497A - A kind of diesel vehicle SCR system ageing failure rapid diagnosis system and method - Google Patents
A kind of diesel vehicle SCR system ageing failure rapid diagnosis system and method Download PDFInfo
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- CN108343497A CN108343497A CN201810050635.0A CN201810050635A CN108343497A CN 108343497 A CN108343497 A CN 108343497A CN 201810050635 A CN201810050635 A CN 201810050635A CN 108343497 A CN108343497 A CN 108343497A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1614—NOx amount trapped in catalyst
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The present invention provides a kind of diesel vehicle SCR system ageing failure rapid diagnosis system and methods, by diagnosing interface installation data acquisition terminal, the real-time speed for acquiring diesel vehicle actual motion, diesel engine running state parameter, NO in the OBD of diesel vehicleXThe signals such as concentration, the data information of acquisition uploads to cloud monitoring platform in real time by GPRS technologies, diagnosis computation model is devised in cloud monitoring platform, monitoring in real time, quick diagnosis diesel vehicle the situations such as the ageing failure of SCR system, realize the function whether SCR system of remote online diagnosis diesel vehicle works normally.It is of the present invention monitoring and ageing failure inline diagnosis in real time effectively to be carried out to the working condition of diesel vehicle SCR system; it can more efficiently supervise and repair diesel vehicle; improve the environmental protection ability of the whole society; the upgrading for also energetically having pushed automobile Related product simultaneously, whole promoted horizontal to automobile industry have positive facilitation.
Description
Technical field
The invention belongs to the online diagnosing technique of support shaft fields of diesel vehicle SCR system ageing failure, more particularly, to a kind of diesel oil
Vehicle SCR system ageing failure rapid diagnosis system and method.
Background technology
Currently, the moving sources pollutant effulent such as motor vehicle of China's field of traffic has become the great of China's environmental improvement
Problem.By the end of the year 2016, national vehicle guaranteeding organic quantity reaches 2.95 hundred million, and it is dirty that automotive emission has become China's air
The main source of dye is to cause ozone pollution, PM2.5Major reason, nitrogen oxides NOXIt is the primary pollution that ozone is formed.
It is put into effect according to Chinese Ministry of Environmental Protection《Chinese automotive environment manages annual report》(2017) data, China motor vehicle NO in 2016XDischarge
577.8 ten thousand tons.
In order to reduce the NO of diesel vehicleXDischarge, Section IV, the heavy-duty diesel vehicle generally use SCR skills of V discharge phases in China
Art route is to meet NOXThe requirement of emission limit.But during SCR uses, generally existing SCR system signal fault or aging
Situations such as failure.Although current each state has all formulated corresponding discharge standard and has carried out periodic detection to diesel vehicle, these tradition
Detection be all non real-time detection, on the one hand, must be parking detection when detection, live band inconvenience to people；On the other hand,
Fraudulent chance is left to car owner, is unfavorable for finding the high emission vehicle of SCR system ageing failure in time, to social living environment
Hidden danger is brought with people's health.
Onboard diagnostic system (On-Board Diagnostic, OBD) is a kind of normal work of guarantee vehicle emission control system
The real-time monitoring diagnosis system made.Currently, being typically all for Diesel Exhaust Cleanse System ponent design technology and diagnosis side
Method is studied, and normally whether diagnosis then lacks reliable and effective diagnostic techniques and diagnostic method for clarifier work.
Present invention is generally directed to regulation HJ437-2008《Automobile-used compression-ignited, gaseous fuel spark-ignition engine and Automobile
The requirement of diagnostic system (OBD) technology of load》In relevant regulations, the data collection station based on OBD of exploitation passes through connection
Cloud monitoring platform on real-time collected vehicle data transmission to network is monitored in cloud to the data acquisition device of OBD interfaces
Pass through accurate algorithm and diagnosis in platform, you can determine whether the SCR system of diesel vehicle has signal fault and ageing failure, it is complete
At towards state IV, the long-range monitoring of the large diesel engine SCR system ageing failure in state V stages and fast diagnosis method.
Invention content
In view of this, the present invention is directed to propose a kind of diesel vehicle SCR system ageing failure rapid diagnosis system, to realize state
IV, the long-range monitoring of the large diesel engine SCR system ageing failure in state V stages and quick diagnosis.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of diesel vehicle SCR system ageing failure rapid diagnosis system, including data collection station, cloud monitoring platform；
The OBD of the data collection station connection diesel vehicle diagnoses interface, includes but not limited to diesel oil for acquiring in real time
The supplemental characteristic generated in vehicle actual moving process；
The signal of acquisition is transmitted to cloud monitoring platform by the data collection station by GPRS network；
Diagnosis computation model is equipped in the cloud monitoring platform, for calculating the data that data collection station is sent
The remotely monitoring to diesel vehicle SCR system working condition and ageing failure diagnosis are realized in analysis；The diagnosis computation model includes
NOXSensor signal authenticity diagnostic module, discharge computation analysis module, diagnostic module, result output module.
Further, the data of data collection station acquisition include but not limited to diesel vehicle actual motion speed,
Diesel engine running state parameter, NOXConcentration signal.
Further, the NOXSensor signal authenticity diagnostic module is for circuit connection failure self examine
It is disconnected, including short trouble, open fault, sensor supply voltage whether in the reasonable scope, NOXWhether signal is more than NOXMost
Big confidence values.
Further, the discharge computation analysis module is used to receive the data information of diesel vehicle data collection station, into
Row NOXSpecific power discharge calculates.
Further, the diagnostic module is used for according to NOXSensor signal authenticity diagnostic module, discharge calculate analysis
The result of module exports, and is diagnosed to the working condition of SCR system.
Further, the result output module is used to the diagnostic result of diagnostic module carrying out real-time results output, letter
Breath prompt and alarm.
Compared with the existing technology, a kind of diesel vehicle SCR system ageing failure rapid diagnosis system of the present invention has
Following advantage：
The present invention carries out data monitoring and diagnosis by the diesel vehicle CAN line signals of OBD remote collections, can be effectively right
The working condition of diesel vehicle SCR system carries out monitoring and ageing failure inline diagnosis in real time.Through the invention, can not only more increase
The supervision of effect ground and repair diesel vehicle, improve the environmental protection ability of the whole society, while also energetically having pushed automobile Related product
Upgrading, whole promoted horizontal to automobile industry have positive facilitation.
Another object of the present invention is to propose a kind of diesel vehicle SCR system ageing failure fast diagnosis method, to realize
State IV, the long-range monitoring of the large diesel engine SCR system ageing failure in state V stages and quick diagnosis.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of diesel vehicle SCR system ageing failure fast diagnosis method, specifically comprises the following steps：
(1) data collection station acquisition diesel engine speed, torque percentage, air-mass flow, NO are utilizedXConcentration is believed
Number, the data of acquisition are transmitted to cloud monitoring platform with 1Hz frequencies；
(2) NO of cloud monitoring platformXSensor signal authenticity diagnostic model carries out self diagnosis to circuit connection failure；
(3) the discharge computation analysis module of cloud monitoring platform is carried out according to the data that data collection station acquires in Trip chain
The NO of short strokeXSpecific power discharge calculates, and obtains the NO of each short strokeXSpecific power discharge value；
(4) cloud monitoring platform is based on NO using diagnostic moduleXSpecific power emission limit overrun condition is diagnosed；
(5) cloud monitoring platform is exported diagnostic result using result output module in real time, row information of going forward side by side prompt and alarm.
Further, step (3) calculation formula is as follows：
Wherein, PeFor effective power, kW,
MeTo survey effective torque, reference torque × torque percentage；
N, rotating speed, r/min；
The formula 2 of exhaust mass flow (kg/h)=air-mass flow × 1.3
Wherein, 1.3 be diesel engine intake and exhaust mass flow conversion empirical coefficient；
NOXDischarge quality (kg/h)=[(exhaust mass flow/29)×NOXConcentration value] × 46 formula 3
29 be air molal weight；46 be NOXMolal weight；
NOXBrake specific exhaust emission (g/kWh)=(NOXDischarge quality (kg/h) × 1000)/PeFormula 4.
Further, the vehicle-mounted discharge result is judged that data collection station is adopted with reference to the limit value of work(base window technique
The data transmission of collection is defeated to arrive cloud monitoring platform, according to NOXSpecific power computation model is calculated, and determines SCR system ageing failure
Judgement standard limit.
A kind of diesel vehicle SCR system ageing failure fast diagnosis method of the present invention and a kind of above-mentioned diesel vehicle SCR
The advantageous effect of system aging failure rapid diagnosis system is identical, and details are not described herein.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is that data acquisition connection and signal transmission and diagnosis of the diesel vehicle based on OBD described in the embodiment of the present invention are flowed
Journey schematic diagram；
Fig. 2 is the NO described in the embodiment of the present inventionXSensor circuit connects the diagnostic process of dependent failure；
Fig. 3 is the short stroke fragmentary views in certain Trip chain described in the embodiment of the present invention；
Fig. 4 is the NO of each short stroke in a certain Trip chain described in the embodiment of the present inventionXSpecific power discharge value schematic diagram；
Fig. 5 is the normal SCR system emission result schematic diagram of state's IV vehicles described in the embodiment of the present invention；
Fig. 6 is the normal SCR system emission result schematic diagram of state's V vehicles described in the embodiment of the present invention；
Fig. 7 is the state IV vehicle SCR system ageing failure emission result schematic diagrames described in the embodiment of the present invention；
Fig. 8 is the state V vehicle SCR system ageing failure emission result schematic diagrames described in the embodiment of the present invention.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To express or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The present invention proposes a kind of diesel vehicle SCR system ageing failure quick diagnosis system based on OBD remote online monitorings
System and method, belong to the online diagnosing technique of support shaft of diesel vehicle SCR system ageing failure.By diagnosing interface peace in the OBD of diesel vehicle
Data collection station is filled, in real time the speed of acquisition diesel vehicle actual motion, diesel engine running state parameter, NOXThe signals such as concentration,
The data information of acquisition uploads to cloud monitoring platform in real time by GPRS technologies, and diagnosis is devised in cloud monitoring platform and calculates mould
Type, monitoring in real time, quick diagnosis diesel vehicle the situations such as the ageing failure of SCR system, realize remote online diagnosis diesel vehicle
The function whether SCR system works normally.
As shown in Figure 1, diagnostic system includes mainly diesel vehicle, OBD diagnosis interface, data collection station, data-signal, cloud
Monitoring platform, NOXSensor signal authenticity diagnostic module, discharge computation analysis module, diagnostic module, result output module,
The OBD of wherein data collection station connection diesel vehicle diagnoses interface, acquires the CAN line signals of diesel vehicle, including diesel engine speed,
Torque percentage, air-mass flow, NOXThe signals such as concentration.The data of acquisition are transmitted to cloud monitoring platform, cloud with 1Hz frequencies
Monitoring platform has NOXSensor signal authenticity diagnostic module, discharge computation analysis module, diagnostic module, result export mould
Block realizes the functions such as data collection, storage, analyzing processing, diagnosis, alarm.Data collection station has both GPS functions, can adopt
Operating speed, the engine speed in CAN lines, torque percentage, charge flow rate, the NO of collection, record, transmission vehicleXConcentration etc.
Information, and cloud monitoring platform is transmitted to by the SIM card in terminal；Cloud monitoring platform can be realized to the data
The reception of acquisition terminal transmission data, data calculate the functions such as analysis, computation model diagnostic analysis, status alert, and having can
Depending on the interfaces UI of change.
1, the NOXSensor signal authenticity diagnostic module, by carrying out self diagnosis to circuit connection failure.It is based on
OBD diagnoses the CAN bus information of interface acquisition to judge NOXWhether sensor has the failure that circuit connects, and conventional fault includes
Short trouble, open fault, sensor supply voltage whether in the reasonable scope, NOXWhether signal is more than NOXMaximum it is credible
Value (refers to NOXThe measurement range 0~1500 × 10 of sensor-6)。NOXSensor circuit connects the diagnostic process of dependent failure such as
Shown in Fig. 2.
2, based on the data acquisition terminal acquisition speed, diesel engine speed, torque percentage, NOXThe signals such as concentration
As NOXThe input of sensor signal authenticity diagnostic model carries out the NO of short stroke in Trip chainXSpecific power discharge calculates, root
According to the monitoring limit value designed by monitoring department, to NOXEmission behaviour judged, the working condition of SCR system is examined
It is disconnected.
3, the NOXSensor signal authenticity diagnostic module is one with Trip chain and judges event, carried out to Trip chain
Short stroke moves short-movie section cutting, and short stroke cutting mode builds a movement with idling starting point to the starting point of next idling
Segment, as shown in Figure 3.
4, the NO of the short stroke segmentXSpecific power discharges computing module, is calculated based on following formula.
Wherein, PeFor effective power, kW,
MeTo survey effective torque, reference torque × torque percentage；N, rotating speed, r/min；
The formula 2 of exhaust mass flow (kg/h)=air-mass flow × 1.3
Wherein, 1.3 be diesel engine intake and exhaust mass flow conversion empirical coefficient；
NOXDischarge quality (kg/h)=[(exhaust mass flow/29)×NOXConcentration value] × 46 formula 3
29 be air molal weight；46 be NOXMolal weight；
NOXBrake specific exhaust emission (g/kWh)=(NOXDischarge quality (kg/h) × 1000)/PeFormula 4.
According to heretofore described NOXThe method of specific power discharge value calculates the NO of each short strokeXSpecific power is discharged, with
For one five diesel vehicle of state, the NO of each short stroke in a certain Trip chain of the vehicleXSpecific power discharge value is Fig. 4.
5, the present invention is to be based on NO to SCR system ageing failureXSpecific power emission limit overrun condition is diagnosed.
(6) present invention proposes NOXThe determination method of specific power emission limit, with reference to DB11/965-2013《Heavy-duty car is arranged
Gas pollutant emission limit and test method (vehicle-mounted method)》, respectively to three state IV and three state V heavy-duty diesel oils new cars into driving
Emission test is carried, while on-road emission test, installation data acquisition terminal carries out the acquisition of data.Vehicle-mounted discharge result is with reference to work(base
The limit value of window technique is judged that the data transmission of data collection station acquisition is defeated to arrive cloud monitoring platform, according to NOXSpecific power meter
Model is calculated to be calculated.The on-road emission test qualification rate of new car SCR system normal operating conditions acquires NO based on OBD dataXCompare work(
Rate computation model (the specific power discharge (see Fig. 5, Fig. 6) of cumulative frequency 90%, g/kWh) is shown in Table 1, SCR system normal condition
Different test modes qualification rate.The vehicle tested all by on-road emission test, is synchronized by data collection station and is adopted
The data of collection pass through NOXSpecific power computation model calculates, NOXThe cumulative frequency of specific power discharge reaches NO when 90%XCompare work(
Rate discharge value, state's IV diesel vehicles are averaged NOXSpecific power discharge value is 10.7g/kWh, is multiplied by deterioration factor 1.2 (at the beginning of the present invention
Determine 1.2), to determine that state's IV vehicles judge the NO of ageing failureXSpecific power discharge value limit value is 13.0g/kWh；The NO of state's V diesel vehiclesX
It is 9.0g/kWh that specific power, which discharges average value, is multiplied by deterioration factor 1.2, and specific power discharge value is 11.0g/kWh.Pass through
Method proposed by the present invention determines the judgement standard limit of state IV, state V vehicle SCR system ageing failures.
Table 1
(7) present invention judges the NO of SCR system ageing failure in propositionXAfter specific power emission limit method, by artificial
Manufacture NOXDischarge the emission limit reasonability that exceeded simulation SCR system ageing failure formulates verification.By carrying out urea water mixing
On-board emission test and the acquisition of synchronous data collection terminal are carried out again after (simulation SCR system ageing failure), and test result is shown in Table
2, the different test mode qualification rates of SCR system ageing failure situation not by on-road emission test, and are adopted based on OBD data
The NO of collectionXThe qualification rate of 90% specific power of the normal condition cumulative frequency discharge of computation model is shown in 45%~72% range
Fig. 7 and 8, discharge is transfinited, and shows SCR system ageing failure, demonstrates the NOX specific powers row proposed by the present invention based on Trip chain
The limit value put judges the feasibility of the ageing failure method of SCR system.
Table 2
(8) diagnostic module is according to NOXSensor signal authenticity diagnostic module, the result for discharging computation analysis module
Output, diagnoses the working condition of SCR system.
(9) diagnostic result of diagnostic module is carried out real-time results output, information alert and alarm by the result output mould
Deng.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (9)
1. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system, it is characterised in that：It is supervised including data collection station, cloud
Survey platform；
The OBD of the data collection station connection diesel vehicle diagnoses interface, includes but not limited to that diesel vehicle is real for acquiring in real time
The supplemental characteristic generated in the operational process of border；
The signal of acquisition is transmitted to cloud monitoring platform by the data collection station by GPRS network；
Diagnosis computation model is equipped in the cloud monitoring platform, the data for being sent to data collection station, which calculate, divides
The remotely monitoring to diesel vehicle SCR system working condition and ageing failure diagnosis are realized in analysis；The diagnosis computation model includes
NOXSensor signal authenticity diagnostic module, discharge computation analysis module, diagnostic module, result output module.
2. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system according to claim 1, it is characterised in that：Institute
State data collection station acquisition data include but not limited to the speed of diesel vehicle actual motion, diesel engine running state parameter,
NOXConcentration signal.
3. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system according to claim 1, it is characterised in that：Institute
State NOXSensor signal authenticity diagnostic module is used to carry out self diagnosis, including short trouble, open circuit to circuit connection failure
Failure, sensor supply voltage whether in the reasonable scope, NOXWhether signal is more than NOXMaximum confidence values.
4. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system according to claim 1, it is characterised in that：Institute
The data information that discharge computation analysis module is used to receive diesel vehicle data collection station is stated, NO is carried outXSpecific power discharge calculates.
5. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system according to claim 1, it is characterised in that：Institute
Diagnostic module is stated for according to NOXSensor signal authenticity diagnostic module, the result output for discharging computation analysis module, it is right
The working condition of SCR system is diagnosed.
6. a kind of diesel vehicle SCR system ageing failure rapid diagnosis system according to claim 1, it is characterised in that：Institute
Result output module is stated for the diagnostic result of diagnostic module to be carried out real-time results output, information alert and alarm.
7. a kind of diesel vehicle SCR system ageing failure fast diagnosis method according to the claims, it is characterised in that：
Specifically comprise the following steps：
(1) data collection station acquisition diesel engine speed, torque percentage, air-mass flow, NO are utilizedXConcentration signal, acquisition
Data cloud monitoring platform is transmitted to 1Hz frequencies；
(2) NO of cloud monitoring platformXSensor signal authenticity diagnostic model carries out self diagnosis to circuit connection failure；
(3) the discharge computation analysis module of cloud monitoring platform carries out short row in Trip chain according to the data that data collection station acquires
The NO of journeyXSpecific power discharge calculates, and obtains the NO of each short strokeXSpecific power discharge value；
(4) cloud monitoring platform is based on NO using diagnostic moduleXSpecific power emission limit overrun condition is diagnosed；
(5) cloud monitoring platform is exported diagnostic result using result output module in real time, row information of going forward side by side prompt and alarm.
8. a kind of diesel vehicle SCR system ageing failure fast diagnosis method according to claim 7, it is characterised in that：Institute
It is as follows to state step (3) calculation formula：
Wherein, PeFor effective power, kW,
MeTo survey effective torque, reference torque × torque percentage；
N, rotating speed, r/min；
The formula 2 of exhaust mass flow (kg/h)=air-mass flow × 1.3
Wherein, 1.3 be diesel engine intake and exhaust mass flow conversion empirical coefficient；
NOXDischarge quality (kg/h)=[(exhaust mass flow/29)×NOXConcentration value] × 46 formula 3
29 be air molal weight；46 be NOXMolal weight；
NOXBrake specific exhaust emission (g/kWh)=(NOXDischarge quality (kg/h) × 1000)/PeFormula 4.
9. a kind of diesel vehicle SCR system ageing failure fast diagnosis method according to claim 7, it is characterised in that：Institute
The limit value that vehicle-mounted discharge result is stated with reference to work(base window technique is judged that the data transmission of data collection station acquisition is defeated to supervise to cloud
Platform is surveyed, according to NOXSpecific power computation model is calculated, and determines the judgement standard limit of SCR system ageing failure.
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| CN109443779A (en) * | 2018-11-07 | 2019-03-08 | 中国汽车技术研究中心有限公司 | A kind of dynamic diagnosis extracts diesel vehicle actual motion NOXThe method and apparatus of maximum discharge bad working environments |
| CN109613905A (en) * | 2018-11-07 | 2019-04-12 | 中国汽车技术研究中心有限公司 | A kind of method and apparatus of the high oil consumption bad working environments of Dynamic Recognition heavy-duty commercial vehicle actual motion |
| CN109611185A (en) * | 2018-12-18 | 2019-04-12 | 东风商用车有限公司 | The urea crystals Risk Forecast Method of Urea-SCR after-treatment system |
| CN111335993A (en) * | 2020-03-26 | 2020-06-26 | 安徽华菱汽车有限公司 | Automobile and error reporting method and system for simulating low efficiency of SCR system thereof |
| CN111636954A (en) * | 2020-06-08 | 2020-09-08 | 安徽华菱汽车有限公司 | Heavy diesel vehicle and engine aftertreatment anti-cheating method and system thereof |
| CN111929408A (en) * | 2020-07-21 | 2020-11-13 | 中汽研汽车检验中心（天津）有限公司 | Closed-loop supervision system for emission detection and maintenance of in-use motor vehicle |
| CN112216075A (en) * | 2020-09-10 | 2021-01-12 | 东风汽车集团有限公司 | Early warning method and early warning system for driving severity of vehicle |
| CN112253294A (en) * | 2020-10-23 | 2021-01-22 | 江铃汽车股份有限公司 | Remote online monitoring and optimizing method for SCR efficiency of diesel engine |
| CN112730568A (en) * | 2020-12-07 | 2021-04-30 | 潍柴动力股份有限公司 | Method, device, equipment and medium for verifying detection result of nitrogen oxide sensor |
| CN113187638A (en) * | 2021-05-11 | 2021-07-30 | 东风商用车有限公司 | Method for diagnosing high sulfur content in fuel oil |
| CN113806675A (en) * | 2021-08-06 | 2021-12-17 | 中汽研汽车检验中心（天津）有限公司 | NOx emission and oil consumption characteristic analysis method |
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